Results 31 to 40 of about 1,895 (219)

Melanin concentration gradients in modern and fossil feathers. [PDF]

PLoS ONE, 2013
In birds and feathered non-avian dinosaurs, within-feather pigmentation patterns range from discrete spots and stripes to more subtle patterns, but the latter remain largely unstudied.
Daniel J Field, Liliana D'Alba, Jakob Vinther, Samuel M Webb, William Gearty, Matthew D Shawkey   +5 more
doaj   +1 more source

New mammalian and avian records from the late Eocene La Meseta and Submeseta formations of Seymour Island, Antarctica [PDF]

PeerJ, 2020
The middle–late Eocene of Antarctica was characterized by dramatic change as the continent became isolated from the other southern landmasses and the Antarctic Circumpolar Current formed.
Sarah N. Davis, Christopher R. Torres, Grace M. Musser, James V. Proffitt, Nicholas M.A. Crouch, Ernest L. Lundelius, Matthew C. Lamanna, Julia A. Clarke   +7 more
doaj   +2 more sources

"THE PRESENT STATE OF KNOWLEDGE OF THE CENOZOIC BIRDS OF ARGENTINA" BY TONNI 1980: FOUR DECADES AFTER

Publicación Electrónica de la Asociación Paleontológica Argentina, 2023
“The present state of knowledge of the Cenozoic birds of Argentina” published in Contributions in Sciences in 1980, written by the argentine paleontologist Eduardo Pedro Tonni, became a must-read for those interested in the record of fossil birds.
Claudia P. Tambussi, Federico Javier Degrange, Ricardo Santiago de Mendoza   +2 more
doaj   +1 more source

Ecomorphological Analysis of the Bird Lumbosacral Organ in an Evolutionary Context. [PDF]

J Morphol
Our geometric morphometric analysis of 36 bird species reveals locomotor‐linked adaptations in the lumbosacral organ (LSO). Perching birds show proportionally larger LSOs, while aquatic species exhibit elongated vertebral canals. We demonstrate strong pelvic‐LSO covariation and significant phylogenetic signals, supporting the LSO's role in equilibrium ...
Pelletan I, Cornette R, Abourachid A.
europepmc   +2 more sources

Unexpected microanatomical variation among Eocene Antarctic stem penguins (Aves: Sphenisciformes)

Historical Biology, 2014
The microanatomical and histological structure of Eocene Antarctic stem penguin tarsometatarsi is examined in order to characterise the bone microstructure. Eight adult tarsometatarsi belonging to eight fossil species (Palaeeudyptes gunnari, Palaeeudyptes klekowskii, Anthropornis grandis, Anthropornis nordenskjoeldi, Archaeospheniscus wimani ...
Ignacio A. Cerda, Claudia P. Tambussi, Federico J. Degrange   +2 more
openalex   +3 more sources

Osteological and Soft-Tissue Evidence for Pneumatization in the Cervical Column of the Ostrich (Struthio camelus) and Observations on the Vertebral Columns of Non-Volant, Semi-Volant and Semi-Aquatic Birds [PDF]

, 2015
© 2015 Apostolaki et al. This is an open access article distributed under the terms of the Creative Commons Attribution License [4.0], which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source ...
A Milani, AJ Bezuidenhout, AM Yates, Andrew A. Farke, AS King, AS King, B Müller, BC Livezey, CG Farmer, CG Farmer, D Schwarz, D Schwarz, D Schwarz-Wings, DA Hogg, DA Hogg, DB Wake, DJ Gower, DJ Heard, DR Carrier, Emily J. Rayfield, Emma R. Schachner, ER Schachner, FL Powell, G Mayr, H Magnussen, HE Evans, HG Seeley, HR Duncker, HR Duncker, HR Dunker, HR Dunker, J Bremer, J Harshman, J McLelland, JA Wilson, JA Wilson, JC Welty, JH Brackenbury, JH Brackenbury, JJ Baumel, JN Maina, JN Maina, JN Maina, JN Maina, JN Maina, JN Maina, JR Codd, KF Liem, LM Witmer, LPAM Claessens, LPAM Claessens, M Habib, M Nysten, M Wedel, MJ Wedel, MJ Wedel, MJ Wedel, MJ Wedel, MJ Wedel, Naomi E. Apostolaki, Paul M. Barrett, PC Sereno, PG Tickle, PM O’ Connor, PM O’Connor, PM O’Connor, PM O’Connor, R Fajardo, R Owen, RBJ Benson, RE Brown, RJ Butler, RJ Butler, RL Cieri, SF Perry, SJ Hackett, V Ghetie, W Meister   +77 more
core   +8 more sources

Avian Influenza Virus Surveillance Across New Zealand and Its Subantarctic Islands Detects H1N9 in Migratory Shorebirds, but Not 2.3.4.4b HPAI H5N1. [PDF]

Influenza Other Respir Viruses
ABSTRACT Highly pathogenic avian influenza (HPAI) virus subtype H5N1 has never been detected in New Zealand. The potential impact of this virus on New Zealand's wild birds would be catastrophic. To expand our knowledge of avian influenza viruses across New Zealand, we sampled wild aquatic birds from New Zealand, its outer islands and its subantarctic ...
Waller SJ, Wierenga JR, Heremia L, Darnley JA, de Vries I, Dubrulle J, Robinson Z, Miller AK, Niebuhr CN, Melville DS, Schuckard R, Battley PF, Wille M, Alai B, Cole R, Cooper J, Ellenberg U, Elliott G, Faulkner J, Fischer JH, Fyfe J, Hay L, Houston D, Keys BC, Long J, Long R, Mattern T, McGovern H, McNutt L, Moore P, Neil O, Osborne J, Pagé AS, Parker KA, Perry M, Philp B, Reid J, Rexer-Huber K, Russell JC, Sagar R, Ruru TT, Thompson T, Thomson L, Tinnemans J, Uddstrom L, Waipoua TA, Walker K, Whitehead E, Wickes C, Young MJ, McInnes K, Winter D, Geoghegan JL.   +52 more
europepmc   +2 more sources

New crania from Seymour Island (Antarctica) shed light on anatomy of Eocene penguins [PDF]

, 2013
Antarctic skulls attributable to fossil penguins are rare. Three new penguin crania from Antarctica are here described providing an insight into their feeding function.
Acosta Hospitaleche, Carolina Ileana Alicia
core   +2 more sources

Multiple sex chromosome system in penguins (Pygoscelis, Spheniscidae)

Comparative Cytogenetics, 2017
Penguins are classified in the order Sphenisciformes into a single family, Spheniscidae. The genus Pygoscelis Wagler, 1832, is composed of three species, Pygoscelis antarcticus Forster, 1781, P. papua Forster, 1781 and P.
Ricardo José Gunski, Andrés Delgado Cañedo, Analía Del Valle Garnero, Mario Angel Ledesma, Nestor Coria, Diego Montalti, Tiago Marafiga Degrandi   +6 more
doaj   +3 more sources

Bayesian total evidence dating reveals the recent crown radiation of penguins [PDF]

, 2016
The total-evidence approach to divergence-time dating uses molecular and morphological data from extant and fossil species to infer phylogenetic relationships, species divergence times, and macroevolutionary parameters in a single coherent framework ...
Drummond, Alexei J., Gavryushkina, Alexandra, Heath, Tracy A., Ksepka, Daniel T., Stadler, Tanja, Welch, David   +5 more
core   +5 more sources